header{
    text-align: center;
    line-height: 50px;
    font-size: 20px;
}
main{
    background: url(../image/advertisement-bg.jpg) no-repeat;
    background-size: 1280px;
    background-position: top center;
}
@keyframes myfrist{
    
    0%{
        top:50%;
        font-size: 20px;
        opacity: 0;
        
    }
    25%{
        top: 70%;
        font-size: 25px;
        opacity: 0.25;
    }
    50%{
        top: 80%;
        font-size: 30px;
        opacity: 0.5;
    }
    75%{
        top:90%;
        font-size:35px;
        opacity: 0.75;
    }
    100%{
        font-size: 40px;
        top:80%;
        opacity: 1;
    }

}

.banner{
    animation: myfrist 1.5s linear;
    color: #ffffff;
    font-size: 40px;
    position: absolute;
    left: 50%;
    bottom: 20px;
    transform: translate(-50%,-50%);
}

 .time{
display: flex;
position: absolute;
right: 20px;
top: 10px;
border: 1px solid #cccccc;
background-color: #ffffff;
border-radius: 15px;
padding: 6px;
font-size: 14px;
} 
.time #time1{
    border-right: 1px solid #cccccc;
}
.time div{
    padding: 0 4px;
}
#tt{
    cursor: pointer;
}